220 mW Amplifier (CB20054E)

The output transistors can be BC548 and BC558. The circuit is from a 1975 documentation showing a frequency response from 90 Hz to 12.5 kHz.

| Clique na imagem para ampliar |

Power Grid Distortion Meter (CB23629E)
This interesting circuit measures the distortion of the sinusoidal voltage of the power grid. We...
Voltmeter (CB19740E)
The operational amplifier used in this old application is not common today, but more modern...
50 KHz IF (CB22243E)
Used in 1950s CW receivers, this type of circuit used germanium transistors. The circuit has...